Oil filter AMSOIL or Castrol
I've tried a number of different filters from OEM, Purolator, Amsoil, and Prova. I will say this. When I used the Amsoil filter and did an oil change, the oil came out looking like it went in. So no, not all filter are created equal. I haven't done an oil change with the Prova yet. Not driving as much with WFH.
Changed oil at 7556 miles with Amsoil Signature Series 0w20 and an Amsoil filter. I've noticed over time that the oil in the Honda has darkened faster.
a 5qt Castrol edge 0w-20 container is $19. + $8 for a filter .. $30 every 5K miles is cheap imo..
I use factory filters and 0w40 Castrol (German one) when it’s on sale for $4.99 a qt. I too have 100k on my 2015 gsw 5MT and runs great I been using that oil since new.
I would go with 0w30 or 0w40. I changed my oil and filter at 1k with castrol 0w40 and it runs just fine. I did find a few metal flakes and slivers in my oil filter. Guess they were left overs from being built.
Amsoil signature series is good for 1 year/25000 miles, and the Amsoil ea filter is good for the same. It is cheaper too. Amsoil has been proven many times over to work.
AMSOil Signature oil and their filter, AMSOil trans fluid.
I run AMSoil European Blend (specifically for VW,AUDI, BMW,) and the filter as well. I change my oil around 4-5K depending on my driving during that time. My oil always comes out slightly 'browned' .... never dark.
I run the 5w30 Amsoil 15,000 mile stuff in our 1.8t... it gets changed once a year. Every 4 months i put a new filter on it and top it off. The samples i've sent in and been returned all looked good if the car is just a driver with some occasional track time i wouldn't sweat running Amsoil or any other really good synthetic 10k or more.
Buy a 1.8t Make sure to do a T-belt waterpump service. Then use oem oil filters and castrol syn. 5w40(syn. is optional for VW 1.8ts but I would personally only run syn in a turbo car). Also flush the coolant system. If you do that you will have a 1.8t that will a very nice running car and will not do you wrong.
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